Krud Kutter Multi-Purpose Pressure Washer Concentrate is an eco-friendly, water-based solution that can remove dirt, oil, grease, mildew stains and more. Apply to your affected surface, leave for 3 to 5 minutes and simply wash off without scrubbing. Formula contains anti-corrosive agents to safeguard pressure washer parts. Recommended for use on exterior siding, all types of roofing, stucco, brick, cement, masonry, concrete driveways, pool areas, patio furniture, equipment, RV's, boats and more.